Best way to learn any programming language is to create good programs in it. C++ is not an exception to this rule. Once you decide to write any program you would find that there are always at least two ways to write it. So you need to find out whether you have chosen the best way to implement your program.
That's where you would find this book useful. It contains solutions to all the exercises present in Let Us C++ Second Edition. I would recommend that you learn the language elements from Let Us C++, write programs for the problems given in the exercises and then cross check your answers with the solutions given in this book, you would be well on your way to become a skilled C++ programmer. I am sure you would appreciate this learning path like the lacs of students and professionals have in the past decade.